Boiler.



W. H. CAHALI..

BOILER.

APPLICATION FILED MAR. 3, 191.5.

Patented June 4, 1918.

2 SHEETS-SHEET I.

IIIIIIV W. H. CAHALL. BOILER.

APPLlcAnoN FILED MAR.3,1915.

Patented June 4, 1918.

2 SHEETS-SHEET 2.

A UGH/VHS UNITED sTATEs PATENT onnrcn.

WILLIAM H. cAHALI., on nAcINE, WISCONSIN.

BOILER.

To all whom it may concern v Be it known that I WILLIAM I-I. CAHALL, a citizen of the United States, and a resident of Racine, in the county of Racine and `State of WVisconsin, have made ,certain new and useful Improvements `in Boilers, of which the following is a specification.

My invention relates to improvements in steam boilers and it consists in the combinations, constructions, and arrangements herein described and claimed. j

An object of my invention is` to provide arsteam boiler of the water tube type in which the formation of scale in the water tubes is reduced to a minimum, thereby maintaining a` high eficiency `of the tube heating surface. j Y

A further object of my invention is to provide a boiler of the type described in which a saving of material and labor is eected by providing the boiler with headers at opposite ends thereof, one of the headers having a larger inlet into the steam drum than the outlet from the drum into the other header, the purpose of the greater inlet being to provide for the additional volume of steam generated while the outlet only has to take care of the water.

A further obj ect of my invention is to provide a boiler of the type described in which the surface Vscum in the steam drum may be easily drawn off, together with the sediment which has been deposited.

A further object of my invention `is to provide a novel form of boiler construction in which the inner and outer header plates are braced and held by a common bolt which secures the inner header plate to the steam drum. j

A further object of my invention is to provide an economical boiler construction inwhich a plurality of steam drums may be supported by a saddle formed in a peculiar manner, which renders the construction cheaper and at the same time facilitates the assembling of the boiler.

Other objects and advantages will appear in the following specification andthe novel features of the device will be particularly pointed out in the appended claims.

My invention is'illustrated in the accompanying drawings forming part of this application in which- Figure l 1s a vertical section through the boiler,

F'g. 2 is a vertical sectionthrough apor- Specication of Letters Patent.

Application filed March 3, 1915. Serial No. 11,753.

tion of the boiler showing the means for holding the header in fixed relation `with the steam drum,

Fig.` 3 is an end view of a boiler having two or more steam drums, showing the means for supporting the same,

Fig. I is a perspective view of the saddle for supporting the steam drums,

Fig. 5 is a section along the line `5---5 of Fig. l,

Fig. 6 is a view members. j

\ In carrying out my invention I provide a steam drum consisting preferably of a plurality of sections such as those shown at l",

of one of the retaining 1b and 1c riveted together. At one end of this steam drum is a header, the construe tion of the header and the means of attaching the same to the steam drum forming an important feature of my invention.

As will be seen from Fig. 2 the inner portion of the steam drum section la bears a series of inwardly extending flanges 2 to which are secured bolts 3 by means of pins I or in any other suitable manner. These bolts pass outwardly through the end of the drum portion la as clearly shown in the drawing.

The header consists of an inner sheet metal structure 5 which is provided with openings 6 arranged to receive the ends of the water tubes 7 As will be seen from Fig. 2 that portion of the plate 5 which abuts the end of the drum section 1a is stamped to form an annular groove 5x into which the end of the drum section l? extends. An annular gasket of substantially L-shaped cross section is disposed between the end of the boiler section 1a and the bottom of the groove 5x. As will be clearly seen from Fig. 1 the upper and lower ends of the plate 5 are bent outwardly, the lower end being again bent upwardly, as shown at 5y in Fig. 1, and being secured to the outer header plate 9. It will thus be seen that the joint 5y is on the outside of the boiler awayfrom the fire and hence the tendency of the header to leak at the joint is greatly diminished.

Referring again to Fig. 2 it will be seen that there is an annularilange 10 which forms a stiening member and that the bolts 3 pass out at the end of the boiler section l just adjacent to the flange 10. In Fig. 7 lI have shown one of the retaining members.

being a seinicylinder. The ring or. washer 11 may be slipped over tlievbolt 3 and the edge of the ring i'ests on the portion 12 which is stamped to provide the groove 5,".

Nuts 12 are provided for the bolt 3 and are Y permit the passage of the bolts 3 and inner nuts 14E and outerl nuts 15 are provided for securely holding the outer header plate in position.- At 16 is a closure for the opening 17, this closure being held in position by means of the `clamping member 18. At the opposite end of the boiler isa header having an'inner header plate 19 arranged to receive the tubes 7, this being also made at its bottom in such a manner that the joint 19y between it and the outer header plate 20 is away from the fire. The opposed plates of this header as well as of the one at the opposite end of the boiler are braced by cross braces 21.

The means by which the rear header is attached to the steam drum is best vshown in Figs. 3 and 4. In Fig. 4: I have shown a saddle arranged for supporting two drums A and B. Obviously the construction could be used for supporting more than two drums. In making the saddle I take a piece of flat sheet metal 22 and stamp out openings 23 therein and at the edges of the openings I form ianges24. The sheet is then bent back upon itself to form a fold 25, the

center of this fold coinciding with the axial lines ofthe openings 28. The iianges 211 are bent to form saddle-like supports for the drums. As will be seen from Figs. 1 and 5 openings 26 are provided in the drinn itself and these openings are immediately adjacent the registering openings 23 of the saddle. The drum may now be riveted to the saddle by placing rivets 27 in the rivet holes'in the flanges 24 and riveting them in theordinary manner The edges of the plate 2 2 are then secured to the inner and outer plates `19 and 20 respectively of the lowerI portion of the header.

It will be noted that this construction provides a device in which the drum is provided with outlets into the rear header below the normal water line of the boiler, while the front header is in communication with the drum entirely around the front end of the drum.

From the-foregoing description of the various parts of the device the operation thereof may be readily understood.

` Boilers of this type are at times too large lt0. be shipped ready for use. They are then shipped knocked down and must be assem- .up on the nuts 13 carried by the bolts 3.

These bolts are arranged in circular relation, thus distributing the pressure evenly around the end `ofthe drum. The provision of a common bolt for attaching the inner header plate to the end of the drum and for bracing and spacing the outer plate forms an economical means of assembling and one which is easily manipulated and yetwhich serves its purpose admirably.

In case there should be any leakage between the drum and the inner header plate 5 the gasket 8 lmay be calked to remedy the sameI by inserting a tool between the' wall of the drum and the portion 12 of the header and then calking in the ordinary manner. I prefer to use a soft metal gasket which may be easily upset, thereby aiding in the calking operation.

When the feed water enters the pipe 28 and flows over the pans 29, the solid portions are precipitated out to a certain extent and, as stated, pass into the settling compartment 30 at the rear of the partition 31. The purer water flows over the top of the partition 31 and thence through the openings 26 into the rear header, thence through the boiler tubes and upwardly through the front header. During the passage of the water through the tubes, steam is generated and this steam has access to the drum all around the end of the drum, since the front header completely incloses the end. The steam and the water passing throughthe front header form a greater volume, of course, than the cold water which enters at the rear header, so that in order t0 keep up a constant circulation the combined area of the discharge openings'26 from the drum into the rear header may be, and, in this particular instance, is less than the inlet area from the front header into the drum.

The steam which is generated passes into the steam space and thence rearwardly and out at the outlet 32. there is little or no steam generated to the rear of this outlet 32, but thatthe incoming water and the precipitating pans arey located out of theA path of the dry steam and hence the steam passes out of the boiler as dry steam. u

It will also be noted that the precipitated matter in the compartment 30 is out of the path of the circulating water. There is It will be noted that therei'oreI no tendency for this water circudrain pipe 33 by means of which the matter which has beenlprecipitated in the compartment may be drained off periodically, but since the partition 31 does not extend to the top of the water such draining will cause a flow of the scum which has formed at the top of the water over the upper edge of the partition into the compartment and out through' the drain pipe. The partition 3l therefore forms a means for skimming otl" the scum at the top of the water as well as a means for keeping the sediment from being drawn into the main water circulating path.

I claim:

kl. In a boiler construction, a steam drum having an open end, a header having an inner and an outer header plate, and common means for securing said inner header plate tothe open end of the steam drum and `for bracing the outer header plate.

2. In a boiler construction, a steam drum having an open end, a header having an `inner and `an outer header plate, common means for securing said inner header plate to the open end of the steam drum and for bracing the outer header plate, said coni- I'non means comprising a series of bolts secured to the interior of the drum, adjust able members carried by said bolts and ar ranged to engage a portion of the inner v header, said bolts extending through the outer header, and means 'for securing the outer header to the bolts.

3. In a boiler construction, a steam drum having an open end, a headei1 having an inner and an outer header plate, common means for securing said inner header plate to the open end of the steam drum and for bracing the outer header plate, said coinmon means comprising a series of bolts secured to the interior of' the drum, adjustable members carried by said bolts and arranged to engage a portion of the inner header, and means for securing the outer header to the bolts.

4. In a boiler construction, a steam drum having an open end, a header having an inner and an outer header plate, common means for securing said inner header plate to the open end of the steam drum and for bracing the outer header plate, said means comprising a retaining member slidably associated with each of said bolts and having a lateral projection arranged to engage a portion of the inner header, and a nut carried by each bolt and arranged to bear on said slidable member.

5. The combination with a cylindrical steam drum, ol a header plate having a circular groove stamped in said plate and arranged to receive the end of the steam drum, a gasket disposed in said groove between the end of the drum and the bottom of the groove, an outer header plate, and common means for clamping said inner header plate "to the end of the steam drum and for spac ing said header plates apart and retaining them in their spaced relation.

6. The combination with a cylindrical steam drum, ot' a header plate having a circular groove arranged to receive the end of the steam drum, an L-shaped gasket disposed in said groove between the end of the drum and the bottom of the groove, a portion of said L-shaped gasket extending between the outer wall of the steam drum and the outer side wall of the groove whereby the gasket may be upset to till the space between the outer wall of the steam drum and the outer wall of the groove.

7. The combination with a cylindrical steam drum, of a header plate having a circular groove arranged to receive the end of the steam drum, an L-shaped gasket disposed in said groove between the end ot WILLIAM H. CAI-IALL.

Witnesses:

L. A. STANLEY, SoLoN C. KEMoN.

Copies of this patentmay be obtained for ve cents each, by addressing the Commissioner of Patents.

Washington, D. C. 

